The skies over Doolittle Island in Lake Murray, South Carolina, teem with thousands of purple martins on summer evenings. AGAMI PHOTO AGENCY/ALAMY (The skies over Doolittle Island in Lake Murray, South Carolina, teem with thousands of purple martins on summer evenings. AGAMI PHOTO AGENCY/ALAMY )
The skies over Doolittle Island in Lake Murray, South Carolina, teem with thousands of purple martins on summer evenings. AGAMI PHOTO AGENCY/ALAMY